NCSP Data

In 2012 several significant changes were made in the way chlamydia data are reported. The main change was the introduction of the chlamydia testing activity dataset (CTAD) to collect community (non-GUM service) data. The changes are summarised in ‘Understanding the changes in 2012 chlamydia data’. The improvements mean that data for 2012 onwards are not directly comparable with the data reported in earlier years.


Tables and Figures

The following data tables are presented annually and quarterly:

Table 1: Chlamydia testing data for 15-24 year olds, non-GUM and GUM data.
Data are organised by PHE region, PHE Centre, upper tier local authority and lower tier local authority.

Table 2: Chlamydia testing data for 15-24 year olds by sex and age groups.
Data are organised by PHE region, PHE Centre and upper tier local authority.

Table 3: Chlamydia testing data for 15-24 year olds by testing service type.
Data are organised by PHE region and PHE Centre.

Table 4: Chlamydia testing data for 15-24 year olds by ethnicity.
Data are organised by PHE region and PHE Centre.

Pre-release access:

Details of the post holders given pre-release access 24 hours prior to the data release.


Chlamydia Annual Data

PHE is aware of some data quality issues that are affecting the chlamydia diagnosis rate and other indicators for a small number of local authorities. The patient postcode of residence is used to attribute each test to a local authority: when this information is not submitted to PHE, the test is attributed on the basis of other location information, for example the testing site. If the local authority of residence differs from the local authority of testing site, and postcode of residence data is not submitted to PHE, the test will be misattributed and the published coverage and diagnosis rate indicators will be affected. Please contact your local sexual health facilitator if you require further details on any issues within your area. Contact details are available here.

Despite many changes to service configuration during 2013, the overall diagnosis and testing coverage rates for England have remained stable, and the proportion of total tests that are positive has increased from 7.7% in 2012 to 8.1% in 2013, indicating successful implementation of NCSP guidance on testing policy.

January – December 2013

January – December 2012


Chlamydia Quarterly Data

From now on quarterly data will not be published on this page. You will be able to generate your own quarterly reports on number of tests, diagnoses, testing coverage and diagnosis rates per 100,000 population for your chosen area from the HIV-STI web portal. If you have not yet registered to access the HIV-STI web portal please contact us at ctad@phe.gov.uk and we will generate an account for you to access these reports. The HIV-STI web portal will be updated with Q1 2014 data on Tuesday 5th August.

Annual data tables will still be published on this page. January – December 2014 annual data will be published on this site around June 2015.

October – December 2013 (Q4 2013)


July – September 2013 (Q3 2013)

Please be aware that when data for Q3 2013 was published a number of GUM clinics did not submit data in time to be included. Please see the “Missing Data” sheet for a list of these clinics. The data for local areas that have tests performed in these GUM clinics might show a significant drop in the number of GUM tests for this specific quarter. However there might be other reasons for this drop, for example, miscoding of testing service type and patient postcode of residence fields or a genuine drop in coverage, and these reasons should also be considered when looking at regional or local data.

Since Q3 data were published all GUM clinics have now submitted data for this quarter and these submissions are reflected in the annual 2013 data tables.

April – June 2013 (Q2 2013)


January – March 2013 (Q1 2013)


October – December 2012 (Q4 2012)


July – September 2012 (Q3 2012)


April – June 2012 (Q2 2012)


January – March 2012 (Q1 2012)


STI report for England

The report below provides recent information on trends in STI diagnoses & chlamydia screening activity in England. It provides useful background information for interpreting STI patterns in England & their implications for public health policy and the provision of sexual health services.

Sexually transmitted infections & chlamydia screening in England, 2013


Data Archive

The changes made to chlamydia surveillance in 2012 mean that the old data archived here is not comparable with more recent data.